1. OD HV Upgrade Hans Berns Jeff Wilkes U. of Washington 10/14/01

2. New OD HV Paddle Cards: VME 9U height (14.4") Standard VME C-type front panel and ejector latches for robust and precise mounting High voltage relay instead of jumper for each PMT channel. Front panel DIP switches for manual enable/disable of each channel. LEDs for HV status of each PMT channel on front panel (relay on/off display). Header jack on front panel for relay remote control input. –Remote control system is under development LEMO jack on front panel for each PMT signal –Scope signal available without disconnecting the coax ribbon cable to the QTC.

3. New OD HV Paddle Cards

4. Channel circuit changes Old paddle cards New paddle cards

5. Installation Test installation (Hut 1): 11/21/00 Full installation began: 4/27/01 Completed: 5/2/01

6. Shift workers’ notes Switches and indicators: –enable/disable channel with DIP switch –LED on = enabled Ribbon cable = HV relay power/control Lemos for scope ports HV in from LeCroy supplies Same cables to QTCs

7. Procedure for disabling OD channels Procedure for disabling or enabling an OD channel: –DISABLE the selected HV channel using the LeCroy HV controller in the appropriate hut. –Change the setting of the dip switch for desired channel on its paddle card »red LED next to the LEMO jack of each channel shows whether the relay is on or off. Note: The LEDs monitor relay status only, NOT HV status! –RE-ENABLE the selected HV channel. For full details: see http://www-sk.icrr.u-tokyo.ac.jp/ ~berns/SUPERK/odhelp.html#paddlecards